Halliburton Co.'s (HAL) fourth-quarter earnings shrank 26% as the oil-field-services company reported continued weakness in its North American completion and production business.

However, shares rose 3% premarket to $38.96 after the company beat Wall Street expectations for the quarter. As of Thursday's close, the stock was up 15% over the past three months.

Halliburton is the top seller of services for hydraulic fracturing in North America. Hydraulic fracturing, a process also known as fracking, consists of injecting a mix of water, chemicals and sand at high pressure into deeply buried oil- and gas-bearing shale rock formations to crack them open. But the company's margins have been pressured lately amid higher fracking costs in oil-rich areas and declining demand for services in natural-gas fields.

Halliburton reported a profit of $669 million, or 72 cents a share, down from $906 million, or 98 cents a share, a year earlier. Earnings from continuing operations were 63 cents, down from 98 cents. Revenue improved 3.2% to $7.29 billion.

Analysts polled by Thomson Reuters most recently projected earnings from continuing operations of 60 cents a share on revenue of $7.06 billion.

In the completion and production business, revenue edged up 0.2%, though operating income shrank 45%, including a decline of 67% in its North America segment.

In the drilling and evaluation business, revenue rose 7.9% and operating income was up 0.8%.

Last week, rival Schlumberger Ltd. (SLB) said its fourth-quarter earnings fell amid lower revenue from its international operations and a slowdown in North American onshore activity.

Write to Ben Fox Rubin at ben.rubin@dowjones.com

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